Add FreeMethodBody() to free a MethodDef's body
Add FreeMethodBody() to free a MethodDef's body

kiootic/dnlib,yck1509/dnlib,jorik041/dnlib,Arthur2e5/dnlib,0xd4d/dnlib,picrap/dnlib,ZixiangBoy/dnlib,ilkerhalil/dnlib,modulexcite/dnlib